Paper Information

Journal:   ANIMAL SCIENCE RESEARCHES (FACULTY OF AGRICULTURE, UNIVERSITY OF TABRIZ)   2015 , Volume 25 , Number 4; Page(s) 81 To 92.
 
Paper: 

THE SURVEY OF PLACENTA TRAITS AND ITS EFFECT ON SURVIVAL, BIRTH WEIGHT AND AVERAGE DAILY GAIN OF LAMBS IN GHEZEL SHEEP

 
 
Author(s):  SAEDI S., DAGHIGH KIA H.*, JAAFARZADEH J., HOSEINKHANI A., AHMADZADE GAVAHAN L., ALIJANI S.
 
* DEPARTMENT OF ANIMAL SCIENCE, FACULTY OF AGRICULTURE, UNIVERSITY OF TABRIZ, TABRIZ, IRAN
 
Abstract: 

BACKGROUND: Placenta has an important interface between the fetus and the mother. It plays a special role in the exchange of metabolic and hormonal substances between mother and fetus.
OBJECTIVES: The effect of relationship between maternal factors and placenta properties on birth weight, survival and average daily gain of Ghezel lambs was examined.
METHODS: Placentas of 35 ewes were collected after delivery and target parameters were evaluated.
RESULTS: Litter size had a significant effect (P<0.01) on placenta weight, large and small cotyledons count, cotyledonal density, placenta efficiency, large cotyledon length, birth weight, average daily gain and survival of lambs, while parity just had a significant effect (P<0.01) on placenta eject and large cotyledons length. There was a significant positive correlation between placenta efficiency and cotyledon density (r=0.47, P<0.05), number of cotyledons and cotyledonal density (r=0.7, P<0.01), birth weight and placenta weight (r=0.46, P<0.05), average daily gain and placenta weight (r=0.54, P<0.05) and a negative correlation between placenta weight and placenta efficiency (r=-0.68, P<0.01), placenta weight and cotyledonal density (r=-0.7, P<0.01) in single lambs but there was a positive significant correlation between cotyledon number and cotyledonal density (r=0.74, P<0.01) and negative correlation between placenta weight and placenta efficiency (r=-0.81, P<0.01) in twin lambs.
CONCLUSIONS: Our results showed that birth weight, mortality rate and average daily gain of lambs are influenced by maternal factors and placenta properties, but more studies are required to elucidate effects of placenta properties specifically placenta efficiency and cotyledonal density on lambs health and survival.

 
Keyword(s): GHEZEL SHEEP, MATERNAL FACTORS, PLACENTA, PLACENTA EFFICIENCY, SURVIVAL
 
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